I think about how much it costs and it motivates me. Also I really want to get back into shape and I know if I don't do it, it won't work. I started off with 10 min rides, I add a minute each day so now I am doing 20 min rides and just stopped short at 17 minutes. I have had very little soreness this way. I try to keep up with the cadence and resistance but if I don't, I don't. I think it is more important to keep yourself at a rate you can still talk. That is how you know it is an aerobic rate. If you go higher it is an anaerobic rate and you don't really burn fat at that rate. You start burning fat at a 20 min aerobic rate. I remember that if I don't keep up with the instructor it's okay, I'll get there someday. Right now I am really out of shape so I take it slow and steady. I have already improved my cadence with just 7 rides. I also do the low impact rides, because I am not up to anything higher than that yet. You have got to work at your own pace until you get to the instructor's pace. Just my humbe opinion.